为什么用BREAK无法退出循环？请高手指导

Question

function check_folder(aid)
{var obj_Name=document.getElementsByTagName("SPAN");
var obj_Num =obj_Name.length;
var obj_hasChild = false;
alert(aid+","+obj_hasChild)
if (aid)
{ for (var i=0; i<obj_Num; i++)
    {
       
      var obj = obj_Name[i].id2;      if (obj*1 == aid*1){         if(document.all[(obj_Name[i].id).replace("NodeItem","folder")].nameProp == "mnuDocument.gif"){             obj_hasChild = true;alert("应当退出循环");break}
                                            
             else{            check_folder((obj_Name[i].id).replace("NodeItem",""));alert("没有退出啊|"+(obj_Name[i].id).replace("NodeItem",""))}
          
        }    }}return obj_hasChild}不知道语法错在哪里，请高手指导